如何检查用户是“登录”？

Question

I am using form authentication with below method in my ASP.NET application

FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, true);

How do I check whether user is logged in or not? And how can I get the user name of a logged in user?

Answer 1

I managed to find the correct one. It is below.

bool val1 = System.Web.HttpContext.Current.User.Identity.IsAuthenticated

EDIT

The credit of this edit goes to @Gianpiero Caretti who suggested this in comment.

bool val1 = (System.Web.HttpContext.Current.User != null) && System.Web.HttpContext.Current.User.Identity.IsAuthenticated

Answer 2

最简单的方法：

if (Request.IsAuthenticated) ...

Answer 3

检查它们是否经过身份验证的最简单方法是Request.User.IsAuthenticated我认为（来自内存）

Answer 4

if (User.Identity.IsAuthenticated)
{
    Page.Title = "Home page for " + User.Identity.Name;
}
else
{
    Page.Title = "Home page for guest user.";
}